Microsoft released Compliance Manager Preview, after initially announcing the new service during Ignite 2017 in late September. It is, for now at least, a free service for existing Office 365 customers, that aims to provide a management interface for organization's compliance management activities.

Microsoft has updated Yammer so that new groups use the Office 365 Groups service to manage the identity and membership of the groups. There are far too many “groups” in that last sentence, which kind of illustrates how a surplus of groups might be building up within Office 365.